#!/bin/sh
#
# Copyright © 2015, Jonas Smedegaard <dr@jones.dk>
# Description: Setup SMTP sub-account for use e.g. with nullmailer
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

set -e

exit1() {
	echo >&2 "ERROR: $1"
	exit 1
}

echo "$1" | grep -q '^[a-z][a-z0-9]*$' || exit1 "Illegal character in base username!"

user="$1-smtp"
desc="SMTP sub-account for $1"

adduser --force-badname --no-create-home --shell /bin/false --gecos "$desc" "$user"